Problema Solution
A mother takes 54 minutes to mow the lawn. Her kid takes twice as long. How long would it take for them to do it together?
Answer provided by our tutors
A mother takes 54 minutes to mow the lawn thus her rate is 1/54 lawns per min
Her kid takes twice as long or 2*54 = 108 min thus the kids rate is 1/108 lawns per min
let x represent the number of minutes the need to mow the lawn together thus their together rate is 1/x lawns per min
1/54 + 1/108 = 1/x
by solving we find:
x = 36 min
click here to see the step by step solution of the equation:
it will take them 36 min the mow the lawn together.